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The Amazon weasel (Mustela africana), also known as the tropical weasel, is a species of weasel native to South America. It was first identified from a museum specimen mislabelled as coming from Africa, hence the scientific name.

The European pine marten (Martes martes), known most commonly as the pine marten in Anglophone Europe, and less commonly also known as baum marten, or sweet marten, is an animal native to Northern Europe belonging to the mustelid family, which also includes mink, otter, badger, wolverine, and weasel.

Guloninae is a subfamily of the mammal family Mustelidae distributed across Eurasia and the Americas. It includes martens and the fisher, tayra and wolverine. These genera were formerly included within a paraphyletic definition of the mustelid subfamily Mustelinae.

Most gulonine species are arboreal to a degree. Some of the fashion furs come from this subfamily, i.e. sable, marten.

The honey badger (Mellivora capensis), also known as the ratel ( or ), is widely distributed in Africa, Southwest Asia, and in the Indian subcontinent. Because of its wide range and occurrence in a variety of habitats, it is listed as Least Concern on the IUCN Red List.It is the only species in the mustelid subfamily Mellivorinae and its only genus Mellivora. Despite its name, the honey badger does not closely resemble other badger species; instead, it bears more anatomical similarities to weasels. It is primarily a carnivorous species and has few natural predators because of its thick skin and ferocious defensive abilities.

Notorious for their strength, ferocity, and toughness, honey badgers have been known to attack and repel almost any kind of animal when escape is impossible, even much larger predators like lions. They are listed as the "world's most fearless animal" in the Guinness Book of World Records due to their fearlessness.

Ictonychinae is a subfamily of the mammal family Mustelidae found mainly in the Neotropics (3 species) and Africa (3 species), with one Eurasian member. It includes the grisons, Patagonian weasel, striped polecats, African striped weasel and marbled polecat, respectively. These genera were formerly included within a paraphyletic definition of the mustelid subfamily Mustelinae.

Most members have a mask-like bar or larger dark marking across their face; the African representatives of the group are striped. A defense mechanism common to the group is use of a chemical spray similar to (but not necessarily as strong as) that of skunks.

The Japanese weasel (Mustela itatsi) is a carnivorous mammal belonging to the genus Mustela in the family Mustelidae. It is native to Japan where it occurs on the islands of Honshū, Kyūshū and Shikoku. It has been introduced to Hokkaidō and the Ryukyu Islands to control rodents and has also been introduced to Sakhalin island in Russia.It is often classified as a subspecies of the Siberian weasel (M. sibirica). The two species are very similar in appearance but differ in the ratio of tail length to head and body length. There are also genetic differences which suggest that the two diverged around 1.6-1.7 million years ago. Their ranges now overlap in western Japan where the Siberian weasel has been introduced.Adult males of the Japanese weasel can reach 35 cm (14 in) in body length with a tail length of up to 17 cm (6.7 in). Females are smaller. The fur is orange-brown with darker markings on the head. The species typically occurs in mountainous or forested areas near water. Its diet includes mice, frogs, reptiles, insects and crayfish.

Mink are dark-colored, semiaquatic, carnivorous mammals of the genera Neovison and Mustela, and part of the family Mustelidae which also includes weasels, otters and ferrets. There are two extant species referred to as "mink": the American mink and the European mink. The extinct sea mink is related to the American mink, but was much larger. The American mink is larger and more adaptable than the European mink but, due to variations in size, an individual mink usually cannot be determined as European or American with certainty without looking at the skeleton; however, all European mink have a large white patch on their upper lip, whereas only some American mink have this marking: therefore, any mink without the patch is certainly of the American species. Taxonomically, both American and European mink were placed in the same genus Mustela, but most recently, the American mink has been reclassified as belonging to its own genus Neovison.The American mink's fur has been highly prized for use in clothing, with hunting giving way to farming. Their treatment on fur farms has been a focus of animal rights and animal welfare activism. American mink have established populations in Europe (including Great Britain) and South America, after being released from mink farms by animal rights activists, or otherwise escaping from captivity. In the UK, under the Wildlife & Countryside Act 1981, it is illegal to release mink into the wild. In some countries, any live mink caught in traps must be humanely killed.American mink are believed by some to have contributed to the decline of the less hardy European mink through competition (though not through hybridization—native European mink are in fact more closely related to polecats than to North American mink). Trapping is used to control or eliminate introduced American mink populations.Mink oil is used in some medical products and cosmetics, as well as to treat, preserve and waterproof leather.

The Mustelidae (; from Latin mustela, weasel) are a family of carnivorous mammals, including weasels, badgers, otters, ferrets, martens, mink, and wolverines, among others. Mustelids are diverse and the largest family in the order Carnivora, suborder Caniformia. Mustelidae comprises about 56-60 species across eight subfamilies.

Polecat is a common name for mammals in the order Carnivora and subfamilies Galictinae and Mustelinae. Polecats do not form a single taxonomic rank (i.e., clade); the name is applied to several species with broad similarities (including having a dark mask-like marking across the face) to European polecats, the only species native to the British Isles.

In the United States, the term polecat is sometimes applied to the black-footed ferret, a native member of the Mustelinae, and (loosely) to skunks, which are only distantly related.

Despite the name, polecats, being various caniform mustelids, are more closely related to dogs than cats, which is why they belong to the suborder Caniformia.

In Canada, the term polecat is sometimes applied to electric utility linemen.

The sea mink (Neovison macrodon) is a recently extinct species of mink that lived on the eastern coast of North America in the family Mustelidae, the largest family in the order Carnivora. It was most closely related to the American mink (Neovison vison), with debate about whether or not the sea mink should be considered a subspecies of the American mink (making it Neovison vison macrodon) or a species of its own. The main justification for a separate species designation is the size difference between the two minks, but other distinctions have been made, such as its redder fur. The only known remains are fragments unearthed in Native American shell middens. Its actual size is speculative, based largely on tooth-remains.

The sea mink was first described in 1903, after its extinction; information regarding its external appearance and habits stem from speculation and from accounts made by fur traders and Native Americans. It may have exhibited behavior similar to the American mink, in that it probably maintained home ranges, was polygynandrous, and had a similar diet, though more seaward-oriented. It was probably found on the New England coast and the Maritime Provinces, though its range may have stretched further south during the last glacial period. Conversely, its range may have been restricted solely to the New England coast, specifically the Gulf of Maine, or just to nearby islands. The largest of the minks, the sea mink was more desirable to fur traders and became extinct in the late 19th or early 20th century.

Trigonictis macrodon is an extinct genera and species of mammal related to a grison (genus Galictis) of North America living during the Pliocene through Pleistocene from ~4.1–1.6 Ma. (AEO). existing for approximately 2.5 million years.

A weasel is a mammal of the genus Mustela of the family Mustelidae. The genus Mustela includes the least weasels, polecats, stoats, ferrets and minks. Members of this genus are small, active predators, with long and slender bodies and short legs. The family Mustelidae (which also includes badgers, otters, and wolverines) is often referred to as the "weasel family". In the UK, the term "weasel" usually refers to the smallest species, the least weasel (M. nivalis).Weasels vary in length from 173 to 217 mm (6.8 to 8.5 in), females being smaller than the males, and usually have red or brown upper coats and white bellies; some populations of some species moult to a wholly white coat in winter. They have long, slender bodies, which enable them to follow their prey into burrows. Their tails may be from 34 to 52 mm (1.3 to 2.0 in) long.Weasels feed on small mammals and have from time to time been considered vermin because some species took poultry from farms or rabbits from commercial warrens. They do, on the other hand, eat large numbers of rodents. They can be found all across the world except for Antarctica, Australia, and neighbouring islands.

The wolverine () (also spelled wolverene), Gulo gulo (Gulo is Latin for "glutton"), also referred to as the glutton, carcajou, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae. It is a stocky and muscular carnivore, more closely resembling a small bear than other mustelids. A solitary animal, it has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times larger than itself.

The wolverine is found primarily in remote reaches of the Northern boreal forests and subarctic and alpine tundra of the Northern Hemisphere, with the greatest numbers in Northern Canada, the American state of Alaska, the mainland Nordic countries of Europe, and throughout western Russia and Siberia. Its population has steadily declined since the 19th century owing to trapping, range reduction and habitat fragmentation. The wolverine is now essentially absent from the southern end of its European range.

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